Tertiary Bronchi

The lungs' tertiary bronchi are also called the segmental bronchi. They branch out from the secondary bronchi, which descend from the mainstream bronchi. Lower in the lung, they become smaller and break up into the primary bronchioles. Each tertiary bronchus serves a particular bronchopulmonary segment. The left lung has nine tertiary bronchi, while the right lung has ten. A smooth muscle layer surrounds the respiratory epithelium, a type of moist, ciliated tissue lining the tertiary...

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Anatomy Terms

Cricoid Cartilage
Diaphragm
Left Lower Lobe Bronchus (Secondary)
Left Lower Lobe of Lung
Left Main Bronchus (Primary)
Left Upper Lobe Bronchus (Secondary)
Left Upper Lobe of Lung
Lingula of Lung
Right Lower Lobe Bronchus (Secondary)
Right Lower Lobe of Lung
Right Main Bronchus (Primary)
Right Middle Lobe Bronchus (Secondary)
Right Middle Lobe of Lung
Right Upper Lobe Bronchus (Secondary)
Right Upper Lobe of Lung
Terminal Bronchi and Alveoli
Tertiary Bronchi
Trachea (Windpipe)

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Full Tertiary Bronchi Description

[Continued from above] . . . bronchi's lumen. This layer is made up of two muscular ribbons that spiral in opposite directions. Irregular plates of hyaline cartilage in turn, surround this layer of smooth muscle; these help keep the airway open.